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Table 2

Results of the analysis of three synthetic spectra calculated with FASTWIND (parameters listed under column “Input”) degraded to R = 1000 and SNR = 100, 50.

T309G329 T265G280 T134G166

Input Output Output+Hα SNR = 50 Input Output Output+Hα SNR = 50 Input Output Output+Hα SNR = 50

Teff (kK) 30.9 30.8 ± 0.8 30.8 ± 1.1 30.2 ± 2.0 26.5 26.1 ± 0.8 25.8 ± 1.1 25.9 ± 1.6 13.4 13.3 ± 0.6 13.2 ± 0.5 13.0 ± 0.7
log  g (dex) 3.29 3.25 ± 0.08 3.26 ± 0.08 3.20 ± 0.15 2.80 2.74 ± 0.11 2.72 ± 0.11 2.74 ± 0.13 1.66 1.65 ± 0.17 1.66 ± 0.07 1.63 ± 0.16
ξ (km s-1) 14.0 13.6 ± 3.3 14.4 ± 4.1 13.0 ± 6.4 17.0 17.5 ± 4.0 17.9 ± 5.9 15.0 ± 8.0 20.0 22.5 ± 5.3 19.6 ± 3.4 20.5 ± 5.0
He/H 0.10 0.12 ± 0.03 0.13 ± 0.04 0.12 ± 0.05 0.12 0.15 ± 0.04 0.14 ± 0.05 0.13 ± 0.05 0.16 0.15 ± 0.04 0.16 ± 0.04 0.12 ± 0.05
Si/Si 1.00 1.01 ± 0.25 0.94 ± 0.24 0.87 ± 0.28 0.75 0.78 ± 0.30 0.66 ± 0.30 0.82 ± 0.0.27 0.80 0.97 ± 0.23 0.81 ± 0.23 0.89 ± 0.27
log  Q  −12.70  −12.90 ± 0.35  −12.62 ± 0.20  −12.89 ± 0.33  −12.30  −12.30 ± 0.20  −12.31 ± 0.20  −12.34 ± 0.20  −12.20  −12.24 ± 0.20  −12.19 ± 0.20  −12.28 ± 0.10

Notes. The resulting parameters without Hα are gathered in column “Output”. The process was also repeated including Hα, to estimate the effect of its absence on the stellar parameters (“Output+Hα). The SNR = 50 case considers Hα.

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